Electrically-heated tank or reservoir.



F. G. CLARK, P. ACKERMAN 8: C. E. CANSFIELD.

ELECTRICALLY HEATED TANK 0R RESERVOIR.

APPLICATION FILED IULYS. I917.

1,269,053. Patented J 11116 11, 1918..

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TORONTO, ONTARIO, CANADA, ASSIGNORS TO THE TORONTO POWER COMPANY LIMITED,'OF TORONTO, ONTARIO, CANADA, A CORPORATION OF ONTARIO.

ELECTRICALLY-HEATED TANK OR RESERVOIR.

Specification of Letters Yatent.

Patented J une 11, 1918.

Application filed July 5, 1917. Serial No. 178,622.

tario, Dominion of Canada, have invented certain new and useful Improvements in Electrically-Heated Tanks or Reservoirs and we hereby declare that the following is a full, clear, and exact description of the same. I

This invention relates to a tank'or reservoir heated by two or more electric heater elements, either or both of which may be selectively used for raising the tank content to the required temperature, to supply the normal daily demands and the increased and the urgent demands occurring periodically and at irregular intervals; the capacity of the tank and the heat-generating power of the heater elements being correctly proportioned for this purpose, and the selective operation of the heaters being controlled either manually or automatically.

In carrying out the inventlon, one of the heater elements, which may be termed the main heater, is continuously used for heating the. tank content, the. capacity of the tank and the heat-generating power of this heater element being so proportioned as to satisfy the normal daily demands, such continuous use obtaining theusual preferential rates for electric service. The other of the heater elements, which may be termed the auxiliary heater is brought into use when the tank content is required to meet urgent or increased demands, the main heater element being placed so that the whole of the tank content may be uniformly heated to the required temperature, and the auxiliary heater element being. placed so that the upper part of the tank content may be quickly raised to the required temperature, either when in the tank, or as it flows to the discharge pipe.

In the drawings: v

Figures 1, and 2, are sectional elevational views of two preferred modifications of our invention.

Details of the electric heater elements and the control devices are not shown, as we may use any type of electric heater element or elements and any type of manual or thermostatic control.

1 represents a tank or reservoir which is preferably covered with heat insulation 2. 3 represents the inlet pipe entering the tank or reservoir and discharging preferably near the bottom of the tank. 4 represents the outlet pipe from the tank, and 5 represents a drain pipe and cock.

A represents the main electric heater ele ment, and B the auxiliary heater element.

.a, a and b,'b respectively represent the terminals of the respective heater elements A and B.

10 and 11 represent the two line wires connecting to some source of electric power, and 12 and 13 are the connections between the line wires 10 and 11 and the terminals a and a respectively, of the main heater A. lat and 15 are corresponding connections to the auxiliary heater B, 14 connecting directly to the heater terminal 6', and 15 connecting through the manually controlled switch- 16 or the thermostatically-controlled switch 17 to the terminal 5 The control switch 16 and the themostatic switch 17 are shown shunting each other, so that the circuit of the electric heater B may be closed independently by either of the two switches.

In Fig. 1, the main heater A is attached to the by-pass pipe 7, having an inlet at 6 into the side of the tank, and the auxiliary heater B is attached to a pipe 8 connecting from the by-pass pipe 7, below the heater A, to the outlet pipe 4, preferably at the top of the tank.

Fig. 2 shows another method of using the electric heater elements, in which the main heater element A is arranged in the same way as in Fig. 1 and the auxiliary heater element B is attached to a pipe 9 connecting from the pipe 7, above its inlet 6into the tank, to the outlet pipe 4.

In all cases, the auxiliary heater can be controlled either manually by means of the switch 16, closed at times of excessive demand, or controlled automatically by means of a thermostatic switch which will close the circuit through the auxiliary heater B at a, predetermined low temperature and open it when a predetermined high temperature has been attained.

These various figures indicate the principle of utilizing the main heater A to uniformlyheat-the Whole of the tank content to a temperature-which Will provide a stor age supply readyfor constant use, to meet the normal daily demand; of utilizing the auxiliary heater B to assist the main heater A in supplying any increased demand, by quickly raising the temperature of-part of the tank content; and of utilizing either a thermostatic or manual device for bringing the auxiliary heater into use, the thermostatic device automatically maintaining the temperature in the top, of the tank at a predetermined degree. I

The heaters may be used in connection with a tank or reservoir designed for any particular purpose, and the heaters mayia eaete a Toy-pass pipe having an inlet into the side on said pipe, a pipe connecting the by-passpipe with the top. of the, tank, an auxiliary electric .heater installed on the connecting pipe, and means controlling the circuit of of the tank, a main electric heater installed the current through said heaters.

- '2. An electrically heated tank comprising a by-pass pipe having an inlet into the side of the tank, a main electric heater installed on said pipe Wit the top of the tank, an'auxiliary electric heater installed on the connecting pipe,'electrical conductors for the main and auxiliary heaters, and means selectively controlling the circuit of the current to the heaters for energizing the main heater to heat the entire tank content and the auxilgipe, a pipe connectingthe by-pass 40',

iary heater to heat the upper portion of the tank content. I

Toronto, June 14th, 1917.

FARLEY GRANGER CLARK. PAUL ACKERMAN. CHARLES ERNEST UANSFlELl).

In presence of (lines: RISES, 7 WM. Vomumnn. 

